Dear colleagues,
I face the following issue when I try to import the ASTER GDEM data (ascii format) in the Flow-R environment (http://www.flow-r.org/home):
14:44:02: Error: G[: ones
14:44:02: Error: TCYÌüÍÍ®ÅȯêÎÈèܹñB
14:44:02: Error: G[: DataStudyAreaSelection (line 153)
14:44:02: Error: G[: GuiData>studyarea_Callback (line 82)
14:44:02: Error: G[: gui_mainfcn (line 96)
14:44:02: Error: G[: GuiData (line 20)
14:44:02: Error: G[: @(hObject,eventdata)GuiData('studyarea_Callback',hObject,eventdata,guidata(hObject))
14:44:02: Error: Error while evaluating uicontrol Callback
My ASTER GDEM data with the heading is shown below:
ncols 333
nrows 333
xllcorner 98.3417454074
yllcorner 3.1204627302
cellsize 0.00029999999999999
nodata_value -9999.0
1780.882 (data) ......
I would like to generate the susceptibilty map for Mount Sinabung, Indonesia. Attached file is the ASTER GDEM data (ascii format) of my study area.
Can anyone help me? Any technical assistance is appreciated.
Hi Fatwa,
I have some experience with Flow-R. Did you try to change the map coordinates? I didn´t test the last version but in former releases you had to change the map coordinates in the ascii input file to be dividable by 10 - in your case it should be something like xllcorner: 100 yllcorner: 10. Then it should work. Also bear in mind, that the ASTER DEM has cellsize in arcsec (or so) and is better to resample it to a cellsize dividable by 10. Then you should import the data without problem. Let me know if the problem persist.
Hi Jan,
Thank you for your answer. Would you please let me know how to resample the ascii input file? So it can be divided by 10.
Hi Fatwa,
the easiest way is to resample it in some GIS, (in ArcMap you have "resample" function) but it should work also in other softwares.. I just checked the online help for flow-R and it states, that the coordinates should be dividable by the resolution of the raster. If you use an Aster GDEM, there the resolution should be 1 arc second - which is more less 30 meters. So I suggest you resample your DEM to a 30m cell size and then export the ascii file and change the xllcorner and yllcorner to be dividable ba 30. When you import it back to GIS you simply change the xllcorner and yllcorner in the resulting ASCII file to the original state.. Hoep it helps.
This is quite an old question, but for those who have the same issue, here is an update. You don't need anymore to have the corner coordinates dividable by the cell size. What you really need is:
- A grid with a metric coordinate system
- A cell size that is an integer
Hi, sorry
I face the following issue when i try to running data in Flow-R. After I input all the data (flow accumulation, dem, predefined landslide, landuse, lithology, and plan curvature) and run the data then appeare windows "no source was found". I think the format data predefined source has been right,or I miss something? Is there reference to build the database Flow-R?
Thank you
Hi,
You might want to try doing the identification of the source areas only (no propagation) starting with the simplest configuration (e.g. single criteria) and add other criteria/data sequentially so you can identify which one might dismiss all potential source areas. You can also do the identification of the source areas in GIS software and import the predefined source areas in Flow-R.
Cheers
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